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Among my publications hereby enumerated, let me particularly recommend the following readings: " Comparative Evaluation of Kernel Bypass Mechanisms for High-Perf. Jul, D. Cherubini, T. CucinottaD. CucinottaE. CucinottaMarcel Karnstedt. CucinottaF. Chang, R. Jul, T. Cherubini, E. Filed patents More details on filed patents are available on Google Patents T.

CucinottaM. Vannucci, A. Ritacco, G. Lanciano, A. Artale, J. Barata, E. December November CucinottaA. Meroni, V. July April CucinottaI. October August Cucinotta, A. June CucinottaIvan Bedini.Google Analytics. This site uses Google Analytics. Last updated on 05 July The S o OS Project Service-oriented Operating Systems addresses the needs of high-performance and distributed systems of the future: performance will rely on a parallelism degree which cannot be even imagined nowadays, with thousands of heterogeneous computing elements networked within each single chip, and thousands or milions of machines interconnected by next-generation networks.

The nowadays programming models, Operating System interfaces and architectures cannot scale to such parallelism degree levels. They are simply inadequate for an efficient use of the resources available to the applications of tomorrow. S o OS will shed some light on these issues designing innovative and highly scalable Operating System Models and Architectures, relying on concepts drawn from the domain of Service-Oriented Architectures SOA and GRID computing, encompassing in a holistic view the software layers that go from the application programmer to the kernel developer.

Within the project, we developed a real-time SMP scheduler for the Linux kernel. For more information, refer to the relative article appeared on lwn. ARSim is an open-source tool for the simulation of systems composed of multiple resources managed through adaptive reservation schemes, shared among multiple tasks. A modular architecture allows for modeling various types of task workloads, as well as various control policies.

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The software may be downloaded following this link. Specifically, such components have been refactored and integrated into a modular architecture for the dynamic feedback-based adaptation of the bandwidth through a variety of controllers which are available in the architecture. It aims at supporting the possibility for QoS aware applications to reserve multiple resources at the same time, in a coordinated fashion.Cucinotta T.

This paper presents an architecture for Quality of Service QoS control of time- sensitive applications in multi-programmed embedded systems. In such systems, tasks must receive appropriate timeliness guarantees from the Operating System independently from one another, otherwise the QoS experienced by users may decrease.

Moreover, fluctuations in time of the workloads make a static partitioning of the CPU not appropriate nor convenient, whereas an adaptive allocation based on an on-line monitoring of the application behaviour leads to an optimum design. By combining a resource reservation scheduler and a feedback based mechanism, we allow applications to meet their QoS requirements with the minimum possible impact on CPU occupation.

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We implemented the framework in AQuoSA [8], a software architecture that runs on top of the Linux kernel. We provide extensive experimental validation of our results and offer evaluation of the introduced overhead, which is perfectly sustainable in the class of addressed applications. They are based on a "bandwidth" abstraction, meaning that a task is given the illusion of executing on a dedicated slower processor. In this context, a crucial design issue is deciding the bandwidth that each task should receive.

The point we advocate is that, in presence of large fluctuations on the computation requirements of the tasks, it can be a beneficial choice to dynamically adapt the bandwidth based on QoS measurements and on the subsequent application of feedback control adaptive reservations.

In this paper, we present two novel contributions to this research area. First, we propose three new control algorithms inspired to the ideas of stochastic control. Second, we present a flexible and modular software architecture for adaptive reservations.

An important feature of this architecture is that it is realised by means of a minimally invasive set of modifications to the Linux kernel. The software is interoperable across multiple card devices, and portable across various open platforms. The architectural design is centred around the definition of a new API that allows protected access to the storage and cryptographic facilities of a smart card.

In the envisioned architecture, a smart card driver architecture is partitioned into a lower card-dependent component, that formats and exchanges APDUs with the external device, and a higher cardindependent component, that implements more sophisticated services and interfaces, such as the well known PKCS standard.

Each layer can focus on a smaller set of functionality, thus reducing the effort required for the development as well as the testing and maintenance of each component. The proposed architecture, along with a set of pilot applications such as secure remote shell, secure web services, local login and digital signature, has been developed and tested on various platforms, including Open BSD, Linux, Solaris and Mac OS X, proving effectiveness of the new approach.

The approach is based on the well-known texture vector and minutiae based techniques, where image processing and feature extraction occur on the host, while the card device performs the final match against the on-board template, which is never revealed to the outside world.

This increases security of the template itself and of the applications using it. The matching algorithms have been tuned in order to achieve an acceptable performance despite computation and memory constraints. Experimental results, gathered from our implementation on a Java Card device, highlight feasibility of the hybrid approach, and show to what extent it is possible to trade precision for speed in the verification process, with an appropriate tuning of the on-board matching parameters.

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However, the high variability of the resource requirements hinders a static choice of the scheduling parameters. In this paper we address this problem by a combination of two strategies: adaptive reservations and resource reclaiming.

The first one operates "locally" using the information of a single taskthe second one operates "globally" distributing unused bandwidth between the tasks. In this paper, we show by analytical results and by extensive simulations that the two techniques can be safely and usefully combined.

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Faggioli D. The goal is to guarantee that specified Quality of Service QoS requirements are met. To this end, we advocate the use of a scheduling mechanism able to reserve fraction of the different resources to the competing tasks. Our work is focused on a feedback controlled adaptation of these fractions based on measurements of the QoS experienced by the application. Each task has an execution time stochastically varying in time and it has to be provided with a specified level of Quality of Service QoS.

The problem of feedback control is formalised in the stochastic domain, by expressing QoS requirements in terms of properties to be satisfied by the stochastic process describing the evolution of the system state.Google Analytics. This site uses Google Analytics.

Last updated on 27 July This thesis project has been realized by Gabriele Ara in partial fulfillment of the requirements for the MSc in Embedded Computing Systems. In the domain of network operators, recent technological trends led to replacing traditional physical networking infrastructures with more flexible cloud-based systems, which can be dynamically instantiated on demand.

The paradigm represented by Network Function Virtualization NFV aims to replace most of the highly specialized hardware appliances that traditionally are used to build a network infrastructure with software-based Virtualized Network Functions VNFs to improve network flexibility.

A number of network functions need high-performance and low end-to-end latency. Primary research focus is now into reducing per-packet processing overheads by using user-space networking techniques, allowing applications to avoid the kernel when exchanging data between containers, either on the same machine or between different hosts.

These techniques are generally indicated as kernel bypass mechanisms. In this thesis, a benchmarking framework has been designed and realized, for the purpose of comparing different kernel bypass mechanisms that can be used to exchange data between VNFs deployed on OS containers within a private cloud infrastructure, to determine which is the most suitable to build efficient network infrastructures in the cloud. Among these mechanisms, this work focuses on the evaluation of the Data Plane Development Kit DPDK framework and other tools that are built on top of it e.

This thesis project has been realized by Francesco De Gioia in partial fulfillment of the requirements for the MSc in Embedded Computing Systems, during an internship at Cobham Gaisler Researchin Gothenburg Swedenunder the joint academic supervision of myself and prof. Luca Fanucci. The thesis project has been developed by Giacomo Bagnoli, modifying the JACK low-latency audio infrastructure for Linux, integrating it with AQuoSAa set of modifications to the Linux kernel adding an EDF-based real-time scheduling policy for real-time applications.

The work has also been published and presented at the Linux Audio Conference Queste si basano sul concetto di isolamento temporale delle applicazioni, garantito da opportune politiche di scheduling dei processi e thread da parte dello scheduler del sistema operativo. In questa tesi, si propone di studiare una soluzione che permetta di applicare tali tecnologie al contesto del playback di contenuti audio sul sistema operativo Linux, dove tipicamente il flusso di dati fornito dall'applicazione viene mediato da una serie di componenti software, sia a livello utente server audio personali per la gestione di flussi multiplisia a livello di kernel moduli del kernelche dovranno essere modificati per l'utilizzo di estensioni real-time.

Basi di sistemi operativi e scheduling basato su server, linguaggio C, interesse per le architetture di supporto al playback di contenuti audio, esperienza nella comprensione e modifica del codice di componenti software open-source scritte da altri.

Various smart-card devices or even higher-level APIs may be supported by adding plug-ins to the project. More information is available in the Andrea Angella master thesis.

Descrizione Il processo di sviluppo di software per smart-card continua ad essere particolarmente complesso per la mancanza di appropriati strumenti di supporto allo sviluppo e al debug, se non quelli proprietari messi a disposizione dai singoli fornitori di soluzioni, che comunque spesso sono artificiosamente non interoperabili per ragioni puramente commerciali. Il software dovrebbe permettere di visionare e gestire chiavi, certificati, PIN o file eventualmente residenti sul dispositivo, e di effettuare le varie operazioni di basso o alto livello rese disponibili dai diversi plugin installabili.

Emulation environment for JavaCard compliant smart-cards, allowing the execution of complete tests for solutions based on such platform in an absolutely transparent way.

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Modular and expandable middleware for the management of group cryptographic keys in the multicast setting.Google Analytics. Controlling end-to-end service quality, and particularly real-time performance and reliability, of time-sensitive applications in cloud environments is overly challenging.

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The problem is even harder when trying to switch from the earlier world of network functions shipped as physical boxes, to the emerging paradigm of virtualized cloud-ready elastic network functions, where still the "5 9s" and tight sub-second real-time performance requirements as coming from precise SLAs have to be met. This talk provides an overview of past and ongoing research carried out at Bell Labs on these challenging issues. The continuous evolution of computation and communication technologies is causing a paradigm shift in our own idea of computing.

Indeed, the widespread availability of broadband connections is simply leading to the end of the Personal Computer era, marking the beginning of a new era where computing is mostly distributed. Not only do users delegate heavy-weight and off-line computations to remote servers, but they expect more and more interactive and real-time applications to be readily available on demand, as witnessed by the increasing use of on-line collaborative document editing or video authoring services, for example.

Being a major driver to the Cloud Computing model, a key role in the new computing panorama is being played by virtualization. With the possibility to host multiple virtualized machines seamlessly onto the same physical hardware, the possibility to create virtual network overlays abstracting away from the actual network topology, and the possibility to dynamically live-migrate virtualized machines while they are running, virtualization technologies constitute an enabler for flexible and efficient management of physical resources in data centers.

This talk summarizes key research findings in the area of real-time performance and predictability for virtualized multimedia applications, highlighting some of the research questions that still remain unaddressed.

Furthermore, additional on-going research at Bell Labs that promises to address some of the open questions is shortly presented. By means of experimental results mainly gathered by modifying the Linux kernel, it is shown how it is possible to increase the predictability of real-time applications even on a General Purpose OS like Linux.

This finds interesting applications in a very industrially relevant field like Cloud Computing for multimedia, interactive and real-time applications. By a proper use of scheduling techniques, it is possible to increase the opportunities for server consolidation by achieving a predictable performance of Virtual Machines VMs despite the unpredictability due to co-scheduling of multiple VMs on the same physical host, CPU and core. There are a set of new real-time scheduling algorithms being developed for the Linux kernel, which provide temporal isolation among tasks.

These are based on the specification of the scheduling guarantees needed by the kernel in terms of a budget and a period. However, the currently implemented API seems to be lacking some important features, like a sufficient level of extensibility. This would be required for example for adding further parameters in the future, e.

By means of experimental results mainly gathered by modifying the Linux kernel, it is shown how it is possible to get a tremendous increase in the predictability of real-time applications even on a General Purpose OS like Linux. It is shown how, by a proper use of scheduling techniques, it is possible to increase the opportunities for server consolidation by achieving a predictable performance of Virtual Machines VMs despite the unpredictabilities due to co-scheduling of multiple VMs on the same physical host, cpu, and core.

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Over the past years, real-time technologies, traditionally developed for safety-critical systems, have been applied within new application domains, including consumer electronics e. Recently, Information and Communications Technologies ICTs are moving towards a new generation of business models for service provisioning, where connectivity will represent, for users, only the basic point of access to an infinity of online services.

The widespread availability of high-speed network connections puts the foundations of new paradigms of ICT usage and software development, where more and more of the resources needed by users are provisioned remotely. In the Internet of the Cloud Computing era, distributed computing is likely to become much more widespread than today, not only for activities related to batch processing and storage, but also for interactive and soft real-time applications.

To achieve the level of determinism needed to run real-time tasks inside a VM, the approach envisaged is to use well established real-time scheduling techniques, and in particular resource reservations, for scheduling the VMs. In the workshop, the basic real-time reservation model is presented and various appliances are presented, e. Also, the students will learn how to compile, configure, install and make a basic use of the scheduler for real-time and multimedia applications on Linux.

Future computing platforms are expected to present a paradigm shift. The trend has already begun with multi-core systems. However, it is well-known that these systems do not scale well, as keeping a coherent view of the same shared memory across a large number of cores may hinder the expected performance gains. One important problem that needs to be addressed is how to properly schedule the different activities in the system so that all timing constraints are respected.

In order to keep performance under control, especially for real-time applications, it is important to precisely control how computation is distributed across nodes and when it is executed; and how and when messages are enqueued in the network, be it a on-chip network interconnect, or on a classical inter-node network. It is also shown how to compile, configure, install and make a basic use of the scheduler for real-time and multimedia applications on Linux. Questo sito usa Google Analytics.

Sito aggiornato al 15 Gennaio There are other tipsters who provide equally respectable results through analysis of commonly accessible information. Some tipsters use statistical based estimations about the outcome of a game, and compare this estimation with the bookmaker's odds. If there is a gap between the estimate odds and the bookmakers odds, the tipster is said to identify "value", and a person who bets on such odds when they perceive not a certainty but a "gap in the book" is said to be a "value bettor".

When value is found, the tipster is recommending the bettor to place a bet.

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A tip that is considered to be a racing certainty, that is, almost completely certain to be true, is also called a nap and tipsters in newspapers will tend to indicate the "nap". Tipping is mostly associated with horse racing but can apply to any sport that has odds offered on it. Most National newspapers in the UK employ a tipster or columnist who provides horse racing tips.

Rather than pick a tip for each race that occurs on a given day the normal protocol is to provide a Nap and nb selection. The popular Channel 4 television programme The Morning Line previews weekend horse racing on a Saturday morning culminating in the panel of experts and guests providing their selections for the day.

Sky Sports News runs a similar preview segment including expert analysis of the teams and betting odds relating to Premier League football fixtures on a Saturday. The United Kingdom, morning national Radio 4 Today Programme usually includes a couple of racing tips in its short sports section (Garry Richardson is the usual presenter, although others fill in when he is away) but these are not taken too seriously (in fact the tips are supplied by a well-known newspaper tipster): but the programme tracks Richardson's performance as a tipster for amusement value: he is usually quite well "down" but just very occasionally is "up" after a correct tip at a long price.

Premium tipping services charge a fee for accessing a tip or tips by telephone, internet or post. The more reputable companies will keep an accurate record of their tipping activities enabling a prospective client to assess their past form and so anticipate potential future performance.

There is a lot of scope for less reputable operations to massage these figures or even to fabricate figures in order to attract new customers.

By giving out different tips to different people (unknown to each other) in a horse race, one person must win (essentially, a sweepstake).

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The bettor who won might then assume that they received real insight into the race outcome from the tipster and may then pay for subsequent tips. Australia has led the way in the emergence of tipping competitions where the object is to win prizes for registering virtual bets. The focus of the majority of these competitions has been Australian rules football but the commonly referred to term for the activity of Footy tipping now also covers Soccer, Rugby League and Rugby Union.

In the UK there are a growing number of such competitions but most relate to the Horse Racing industry. In theory, tipping for prizes in a free competition provides a viable alternative to gambling for real. However, many will take the opposite view that it makes gambling more accessible to a wider audience by creating what is perceived to be a safe route in. There is also a lot of scope for gamblers looking to identify good tips using such competitions as an information resource given some competitions publish current tips entered and historical records for the tipsters involved.

Internet forums are increasingly being used as a means to share ideas and information within web communities and many such forums exist in the gambling arena as a means of discussing views on events or simply offering advice and tips. While many in the gambling community view this as a way in which they can earn respect from their peers in an otherwise isolated profession, tipping services also use these areas to attract users to their premium schemes. While the term gambling is often considered to be confined to sports betting or at least the services offered by a bookmaker, the classification can also be applied to investing in stocks where the gamble relates to a share or commodity price moving in a certain direction.

Stock tips, as publicised in the financial sections of the media, are largely directed at the casual investor but their interrelation and interest to the business sector has proven to be controversial. Thus, tipsters themselves can be "tipped" as being a good or bad tipster. Therefore, it is actually possible in theory to bet on whether a tipster's prediction will be correct (rather than bet on the prediction itself).

From Wikipedia, the free encyclopedia Jump to: navigation, searchThis article is about the sporting event tipster. For the DARPA TIPSTER program, see DARPA TIPSTER Program. A short walk across Stanley Park is in store for Everton as they head to Liverpool on Sunday. But getting away from Anfield without conceding will not be easy.

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If you do not already have an account you will need to register here. Once production of your article has started, you can track the status of your article via Track Your Accepted Article. When authors co-submit and publish a data article in Data in Brief, it appears on ScienceDirect linked to the original research article in this journal.

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Econometrics and Statistics is the official journal of the networks Computational and Financial Econometrics and Computational and Methodological Statistics. It publishes research papers in all aspects of econometrics and statistics and comprises of the two sections Part A: Econometrics and Part B: Statistics.

It publishes research papers in all aspects of econometrics and statistics and comprises of the two sections Part A: Econometrics and Part B: Statistics. Emphasis is given to methodological and theoretical papers containing substantial econometrics derivations or showing a potential of a significant impact in the broad area of econometrics. Topics of interest include the estimation of econometric models and associated inference, model selection, panel data, measurement error, Bayesian methods, and time series analyses.

Simulations are considered when they involve an original methodology. Innovative papers in financial econometrics and its applications are considered. The covered topics include portfolio allocation, option pricing, quantitative risk management, systemic risk and market microstructure.

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Interest is focused as well on well-founded applied econometric studies that demonstrate the practicality of new procedures and models. Such studies should involve the rigorous application of statistical techniques, including estimation, inference and forecasting.

Topics include volatility and risk, credit risk, pricing models, portfolio management, and emerging markets. Innovative contributions in empirical finance and financial data analysis that use advanced statistical methods are encouraged. The results of the submissions should be replicable. Applications consisting only of routine calculations are not of interest to the journal. Papers providing important original contributions to methodological statistics inspired in applications are considered for this section.

Papers dealing, directly or indirectly, with computational and technical elements are particularly encouraged. Innovative algorithmic developments are also of interest, as are the computer programs and the computational environments that implement them as a complement. The journal consists, preponderantly, of original research.

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Occasionally, review and short papers from experts are published, which may be accompanied by discussions. Special issues and sections within important areas of research are occasionally published. The journal publishes as a supplement The Annals of Computational and Financial Econometrics.

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